How many grams of chlorine gas are needed to make three. 30×10 to the sixth power grams of a solution that is one. One zero PPM chlorine by mass
I don't understand you post. If you want to show exponents do it this way. Do you want three solutions each with 30E6 grams solution? And you want the solution to be 110 ppm Cl2 by mass?
30E6 can be written also as 30 x 10^6.